t.a.c. TC-5231 Series Instruction manual

Printed in U.S.A. 8-06 © Copyright 2006 TAC All Rights Reserved. F-25911-5
TAC
1354 Clifford Avenue
P. O. Box 2940
Loves Park, IL 61132-2940
www.tac.com
Application
The TC-5231, TC-5232, and TC-5241 low temperature
thermostats are used to control temperature in air
conditioning or refrigeration systems. The low
temperature thermostat measures the coldest one-foot
section along the entire 20-foot sensing element.
The low temperature thermostats are applicable to
various applications such as: low temperature control
of steam coils; frost indication in storehouses or
orchards; temperature control of freezer cabinets,
display cases, beverage coolers, milk cooling tanks,
and air conditioners.
Features
•20 ft. (6.1 m) element senses temperature over a
large area. Control responds to coldest one-foot
section of the sensor.
•Adjustable setpoint from 35 to 60°F (1.7 to 15.5°C)
with 5°F (3°C) fixed differential.
•SPDT and DPST versions.
•Rated for use at 17 full load amps (120/208/240
Vac), 24 non-inductive amps (120/208/240 Vac),
and 16 non-inductive amps (24 Vac). Capable of
controlling refrigeration equipment directly.
•UL and CSA approved.
•Capillary clips provided.
Applicable Literature
•TAC Electric/Electronic Products Catalog, F-27382
•Environmental Controls Application Manual,
F-21335
Low Temperature Thermostats
General Instructions
TC-5231 Series, TC-5232,
& TC-5241 Series
Inve
nsys

2© Copyright 2006 TAC All Rights Reserved. F-25911-5
SPECIFICATIONS
Setpoint Dial Range: Dual marked 35 to 60°F (1.7 to 15.5°C).
Sensing Element: Vapor pressure type, copper construction.
Response: To lowest temperature sensed by any one-foot section of its element. Altitude
causes the control to operate approximately 1°F colder per 1000 ft. of elevation.
Differential: 5°F (3°C) fixed.
Electrical Switch: Snap action SPDT or DPST. Refer to Table-1.
Ratings, Refer to Table-1 and Table-2.
Connections:
TC-52xx, Screw terminals.
Mounting: In any position on any surface not subject to excessive vibration.
Housing: Molded gray PVC plastic cover with a zinc-plated steel main enclosure with a 1/2
in. conduit opening.
Ambient Temperature Limits:
Shipping and Storage, -40 to 150°F (-40 to 66°C).
Operating, Must be 5°F (3°C) above setpoint to a maximum of 150°F (66°C) at case.
Thermal Sensing Element, 300°F (149°C).
Humidity:
Enclosure, 5 to 95% RH, non-condensing.
Thermal Sensing Element, 0 to 100% RH.
Enclosure Rating: NEMA Type 1.
Dimensions:
Case, 2.7 H x 3.44 W x 1.97 D in. (69 x 87 x 50 mm).
Element, 3/32 in. O.D. x 20 ft. length (2.4 mm x 6.1 m).
Agency Approvals: UL 873 Temperature-Indicating and -Regulating Equipment and CSA
Certified.
Table-1 Model Chart.
Table-2 DC Ratings for TC-5232 Only.
Model
Number Device Type Electrical Switch
Voltage
Vac
Full
Load
Amps
Locked
Rotor
Amps
Pilot
Duty
(VA)
Non-Inductive
Amps
TC-5231 Low temp
auto reset SPDTe
24a— — 100 16
120
17 102 720 24208
240c
277 — — — 7.2
TC-5232 Low temp
auto reset DPSTd
24a— — 100 16
120c
24 144 125 24208c
240c
277 — — — 7.2
TC-5241 Low temp
manual resetbSPDTe
24a— — 100 16
120
17 102 720 24208
240c
277 — — — 7.2
a Less than 0.5 Amp is not recommended.
bReset cannot be accomplished until the sensed temperature is at least 5°F above setpoint.
c Full load and locked rotor ratings are suitable for hermetic compressors only.
d Limit two separate circuit loads with common return to < 5885 VA. Only one load may be a motor load.
e Do not exceed pilot duty rating on one side of switch.
Volts FLA LRA NIA PD VA
120 4.6 46 357.5
240 2.3 23 0.5 57.5
600 ———57.5

F-25911-5 © Copyright 2006 TAC All Rights Reserved. 3
TYPICAL APPLICATIONS (wiring diagrams)
AC Supply
Earth Ground
(2)
Indication
Circuit
Fan
Motor
(3)
(1)
1 Terminals (2) and (1) close on temperature drop.
1
Temp
Drop
Figure-1 TC-5231 and TC-5241 Typical Application.
AC Supply
L
L
Fan
Motor
T
T
Indication
Circuit
Note: Contacts are not rated for dry circuit applications.
Less than 1 Amp is not recommended.
2 Terminals L-T open on temperature drop.
2
Figure-2 TC-5232 Typical Application.

4© Copyright 2006 TAC All Rights Reserved. F-25911-5
INSTALLATION
Inspection
Inspect the package for damage. If damaged, notify the appropriate carrier immediately.
If undamaged, open the package and inspect the device for obvious damage. Return
damaged products.
Requirements
•Job wiring diagrams
•Tools (not provided):
–Voltage meter/indicator
–Appropriate drill and drill bit for mounting screws
–Appropriate screwdrivers and wrenches
•Mounting screws, two (2) #10 maximum (not provided)
•Capillary mounting clips (5 provided)
•Training: Installer must be a qualified, experienced technician
T W A R N I N G
•The TC-5231 series, TC-5232, and TC-5241 series devices are designed for use only as
operating controls. Where an operating control failure would result in personal injury
and/or loss of property, it is the responsibility of the installer to add devices (safety, limit
controls) that protect against, or systems (alarm, supervisory systems) that warn, of con-
trol failure.
•Disconnect the power supply (line power) before and during installation to prevent possi-
ble electrical shock and equipment damage.
•Make all connections in accordance with the wiring diagram and in accordance with the
National and Local Electrical Code.
Use copper conductors only.
•Do not restore electrical power until installation is complete.
T C A U T I O N
•Do not exceed the electrical ratings indicated on the label inside the cover of the device.
•Avoid locations where excessive moisture, corrosive fumes, or vibration are present.
Use only in locations suitable for NEMA Type 1 rated devices.
Mounting
T C A U T I O N
•Do not kink the capillary or the thermostat will be damaged.
•To achieve optimum performance, do not mount the thermal element in a vertical pattern.
1. Select a location that permits proper capillary routing. It is important not to twist or strain
the control body or shifting of the calibration may result.
N O T E
•Use only the mounting holes provided in the control frame. Make sure the mounting surface
is flat. Mounting the device to an uneven surface may cause improper control operation.
•Do not let any part of the capillary touch any surface that is colder than the desired
sensing area.
•Do not crush or deform the sensing element when clamping.
•Do not cut the capillary or bulb. Avoid sharp bends, kinks, strains, or pinch marks in the
capillary. Never allow the capillary to rest against sharp edges or rub against metal
surfaces.

F-25911-5 © Copyright 2006 TAC All Rights Reserved. 5
2. Provide a drip loop in the capillary if the body is mounted in any position other than
upright. The thermal element is usually located on the downstream side of the coil.
3. Allow slack so that the capillary is not taut. Install the thermal element securely in the
controlled media for maximum sensing capability and minimum vibration damage.
4. Serpentine the element in a horizontal pattern so that it is exposed to all areas where
low temperatures are possible. See Figure-3.
5. Secure the element into place using the five capillary clips provided.
6. Remove the cover. See Figure-4.
7. Mount the case with two screws (#10 maximum) in the screw slots in the back of the
case. See Figure-6.
8. Connect the appropriate wiring. Follow the wiring instructions in the Wiring section.
Figure-3 Thermal Element Location.
TC-52XX
Duct
Thermal Element
Note capillary
installation pattern
Up
Caution: Do not
bend (kink) capillary
tighter than a 1"
(25 mm) radius or
thermostat will be
damaged.
1.7
4.4
7.2
10.0
12.7
15.5
35
40
45
50
55
60
LOWEVENT
5¡F FIXED
DIFFERENTIAL
¡C ¡F
Setpoint Indicator
Setpoint Adjustment Manual Reset Button
(TC-5241 only)
Thermal Bellows
Thermal Sensing Element
Invensys
Figure-4 TC-52xx with Cover Removed.

6© Copyright 2006 TAC All Rights Reserved. F-25911-5
Wiring
N O T E
Do not adjust the pointer beyond the highest and lowest marks on the scaleplate.
The scaleplate is only for reference, and the final settings should be verified with a
thermometer.
T C A U T I O N
The terminals must not be bent, cut off, drilled, or retapped.
1. Provide a drip loop in the wiring to prevent water from reaching the thermostat.
2. Loosen the green grounding screw provided on the TC-52xx case to connect the unit to
earth ground.
3. Loosen the terminal screws and make the appropriate power wiring connections to the
numbered terminals. The TC-52xx case has an opening for a 1/2 in. conduit fitting. See
Figure-1 and Figure-2 for TC-52xx models.
4. Replace the cover.
5. Adjust the setpoint by turning the setpoint screw until the scale pointer is properly
positioned.
6. Check for proper operation of the device. Follow the instructions in the Checkout
section.
7. At initial start-up of the equipment, observe the capillary for excessive vibration and
make corrections as required.

F-25911-5 © Copyright 2006 TAC All Rights Reserved. 7
CHECKOUT
T C A U T I O N
The unit includes a mechanical stop to prevent adjustment below 35°F (2°C). Do not
attempt to set below 35°F (2°C), or the device may be damaged.
1. If the ambient temperature at the thermal element is within the 35 to 55°F (2 to 13°C) set-
point range, turn the adjustment screw located in the top of the case until the setpoint
exceeds the ambient temperature. Confirm that the snap acting switch has operated.
2. Turn the setpoint adjustment screw until the indicating pointer is at the desired setpoint
temperature.
3. On the TC-5241 model, push the manual reset button to put the thermostat into service.
Manual Operation
of Switch
T C A U T I O N
•When the sensed temperature is below setpoint, the switch is open (terminals 2–3 on
TC-52x1 and terminals L–T on TC-5232), and the tab at the end of the bellows lever is
down. The switch can be momentarily closed by lifting the tab with a screwdriver. See Fig-
ure-5.
•Do not attempt to manually operate the thermostat in any other way as this can damage
equipment and void the warranty.
CALIBRATION
All thermostats are precision calibrated at the factory.
REPAIR
This thermostat is not field repairable. Replace the device if necessary.
1.7
4.4
7.2
10.0
12.7
15.5
35
40
45
50
55
60
LOWEVENT
5¡F FIXED
DIFFERENTIAL
¡C ¡F
Bellows
Lever Tab
Figure-5 Manual Operation of Switch on TC-5231 and TC-5241.

Copyright 2006, TAC
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-25911-5
www.tac.com
TAC
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940
DIMENSIONAL DATA
Dimensions are shown in inches (millimeters).
Figure-6 TC-52xx Mounting Dimensions.
3-1/2 (89) Max. 2 Max.
(51)
2-15/32 (63)
1-3/4
(45)
2-45/64 (69)
Max.
2-3/16 (56)
2-1/16 (52)
Two Mounting Holes
for #10 Screws
Opening for 1/2" Conduit
Fitting this Surface
Front View Side View